Separable fastener



May 5, 1931. G. JoHNsQN 1,804,370

SEPARABLE FASTENER Filed April 29. 1929 vll/IIA III/IIIA 'I Patented May 5, 19731 v Unirse S inertie FASTENER CORPORATION, CAMBRIDGE, FASSACHSETTS, A CORPORATION OF v MASSACHUSETTS 'Y iippiieatio'n fiieaiiprii '29,

My yinvention `aims to provide improvements in separable snap fasteners of the hook tener. In the drawings I have shown the and eye type.

In the. drawings, which illustrate a preferred embodiment of my invention Figure l is an elevation of a watch and wrist strap Showing my improved fastener attached to the strap;

Fig. 2 is a longitudinal sectionthrough the strap and fastener showing the parts of the fastener in normal engagement;v

Fig. 3 is a section similar to Fig. 2, but showing the manner of separating the fastener;

Fig. 4 is a plan of the plate part of the fastener which presents the hook;

Fig. 5 is a plan of the plate part of the fastener which presents the eye or hook engaging portion; and

Fig. 6 is a section showing the fastener when disengaged and showing the eyepresenting plate secured in fixed relation to the flap of an overshoe or the like, the hookengaging portion being shown in elevation.

Referring to the embodiment of my invention illustrated by the drawings, I have shown a hook and eye type of fastener which has its plate-like parts made of sheet metal and which has a snap action during engagement and disengagement of the parts. This device is particularly, though not exclusively, adapted for use as a fastener for overshoes, gloves, wrist watches and the like and may be readily separated Vby a vlifting action exerted at a predetermined side of the fas f n use of the fastener on a wrist watch strap.

The fastener is made in two separate parts which may be rigidly or slidably attached to `The `part A is pressed from sheet metal and is shown (Figs. 2 and t) with two strap-receiving slots 1 1. Between the slots 1-1 I have pressed out of the material a hook 2 having a boss 3 adjacent to its free end. At each side of the hook (Fig. t) yger 4C, each of which is arched slightly in cross-section (Fig. 2) and is spaced below the under side of the hook for purposes hereinafter described.

I have provided a spring fin- SEPARABLE Fasmnivnn 1929. seriai no. 359,039.

The other plateelilre part B is also pressed from Vsheet metal and in Figs. l through is shown provided with two slots 5-5 through which the strap 6 passes. A hook-engagingportionr 7 is provided at one edge of the lpart B and it has an aperture .8 therethrough (Fig. 5) for receiving the hook 2, as shown lin Fig. 2.v The hook-engaging portion eX- tends from the plate part B at an angle to the plane .there-of to facilitate engagement with and* disengagement from the hook 2.

I/Viren engaging thefastener members the hool 2 isyentered into the aperture 8 and the portion 9 ofthe hook-engaging portion 7 is forced between the hook and the spring Yfingers has shown in Fig. 2. A. definite snap action takes piace, as the portion 9 passes by the boss 3,V due to the yielding nature of the spring lingers. Thus, the spring ngers 4 and the boss 3 cooperate tohold the hook and eye against accidental separation. l

To separate the fastener itis merely necessary to` pull outwardly upon the end portion `l() of the strap, as clearly illustrated in Fig. .3. i l

When the fastenerV elements areengaged the i. are securely locked against separation by Vany .stresses-which'are exerted upon the strap inthe directions of the arrows indicated` in Fig. 2. Eveiithough there may be substantial stress exerted upon the strap in a pull on the free end l0 of the strap. `I/Vhile vthereinay be slight yielding -of the hoyolr2 I vB secured to one'iiap 1l of an overslioe by 'means of one or more rivets l2. The plate A is secured to a strap 13 attached to the cover Hap 14 ofthe overshoe.

i lIlie arrangement of the fastener plates may be varied to suit particular use and the formation ofl hey plates and elements thereof may kbe varied to someiextentwithout departing from the nature of my invention. Therefore,

while I havel illustrated and described in dethe directions of the arrows (Fig. 2) the fasf tener may be readily and easily separated by rreinber having an apertured portion at one edge 'aged with said hook portion to secure the two plate members together and said yieldable finger means pressing against said apertured portion to hold it in engagement wit4 the hook portion to prevent accidental disengagement while being adapted to be separated by a pull exerted at a Vpredeterlmined edge of one of the plate members.

2. A snap fastener device comprising two 'sheet metal plate-like members, one of which has means to permit slidable attachment to a strap, a hook formed integral with one of said members, a hook-engaging Vportion presented by the other member anda pair of spring fingers formed from the plate which presents the hook, said spring fingers coop-A erating with the hook and being located adjacent to the sides thereof to engage and hold the hook-engaging portion against accidental separation, each plate and the elements presented thereby being formed from a single piece of metal.

3. A snap fastener device of the hook and eye type comprising, in combination, a onepiece plate part A having a hook 2 and two spring fingers 4 formed intermediate its edges, said fingers being spaced from each other at least the width of the hoolr, a second plate part B having a hook-engaging portion 7 provided with an aperture 8.through which the hook 2 passes when the plates are engaged and said hook-engaging portion 7 having a portion 9 snapped between the Vhook 2 and the spring fingers 4, as and for the purposes described. 'Y

5. A snap fastener device comprising, in combination, a one-piece plate member formed from sheet metal and having a hook portion and yieldable finger means normally pressing toward said hook portion, said hook portion and said yieldable finger means being formed integral with the material of said plate member and being located substantially centrally of said plate member, and a second plate member/having means for engagement with said hook portion to secure the two plate members together and said yieldable nger means pressing against said means provided by said secondplate member, thereby to hold it in engagement with the hook portion to preventaccidental disengagement of the second plate member from the first plate member while being adapted to be separated by a pull exerted at a predetermined edge of one of said plate members. i

In testimony whereof, I have signed my I 'y 4name to this speciiicatwn.

GUSTAV JOHNSON.

Y4. A snap fastener device of the hook and eye type comprising, in combination, a onepiece plate part A having a hoolr 2 and two spring fingers 4 formed intermediateY its edges, said fingers being spaced from each Y other at least the width of the hook, a second plate part B having a hook-engaging portion 7 provided with an aperture 8 through which the hook 2 passes when the plates are engaged, said hook-engaging portion 7 having a portion 9 snapped between the hook'2 and the sp 1ing fingers 4, as and for the purposes described, and a boss 3 pressed from said hook to cooperate with the spring fingers 4 for providing for snap fastening engagement between the hook 2 and the portion 9. 

